AIRBAG SYSTEM, Diagnostic DTC:B161A/8A

DTC Code DTC Name
B161A/8A Lost Communication with Front Satellite Sensor Bus

DESCRIPTION

The front collision sensor circuit (front airbag sensor RH circuit and front airbag sensor LH circuit) is composed of the center airbag sensor assembly, front airbag sensor RH and front airbag sensor LH.

The front airbag sensor RH or front airbag sensor LH detects impacts to the vehicle and sends signals to the center airbag sensor assembly to determine if the airbag should be deployed.

DTC B161A/8A is stored when a malfunction is detected in the front collision sensor circuit (front airbag sensor RH circuit and front airbag sensor LH circuit).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Test Mode / Check Mode

B161A/8A

Lost Communication with Front Satellite Sensor Bus

One of the following conditions is met:

  • The center airbag sensor assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the front collision sensor circuit (front airbag sensor RH circuit and front airbag sensor LH circuit).

  • A front airbag sensor RH malfunction.

  • A front airbag sensor LH malfunction.

  • A center airbag sensor assembly malfunction.

  • Instrument panel wire

  • Engine room main wire

  • Front airbag sensor RH

  • Front airbag sensor LH

  • Center airbag sensor assembly

*1

WIRING DIAGRAM

C210945E06

CAUTION / NOTICE / HINT

Note:

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected (Click here).

PROCEDURE

  1. CHECK FOR DTC

    1. Turn the engine switch on (IG), and wait for at least 60 seconds.

    2. Turn the engine switch off.

      Tip:

      If a communication error occurs, DTCs for both the LH and RH sides will be stored simultaneously. To identify the malfunctioning area, turn the engine switch off and then on (IG) again.

    3. Turn the engine switch on (IG), and wait for at least 60 seconds.

    4. Check for DTCs.

      Click here

      Body Electrical > SRS Airbag > Trouble Codes

      Result

      Result

      Proceed to

      DTCs B1613 and B1618 are not output

      A

      DTC B1613 is output

      B

      DTC B1618 is output

      C
      Tip:

      • DTCs indicating communication errors will be changed to DTCs indicating errors in initialization by turning the engine switch off and then on (IG) again.

      • Codes other than DTCs B1613 and B1618 may be output at this time, but they are not related to this check.

    B

    GO TO DTC B1613/83

    Click here

    Body Electrical > SRS Airbag > Trouble Codes

    C

    GO TO DTC B1618/84

    Click here

    Body Electrical > SRS Airbag > Trouble Codes

    A

  2. CHECK CENTER AIRBAG SENSOR ASSEMBLY

    1. Turn the engine switch on (IG), and wait for at least 60 seconds.

    2. Clear the DTCs stored in memory.

      Click here

      Body Electrical > SRS Airbag > Clear DTCs

    3. Turn the engine switch off.

    4. Turn the engine switch on (IG), and wait for at least 60 seconds.

    5. Check for DTCs.

      Click here

      Body Electrical > SRS Airbag > Trouble Codes

      OK

      DTC B161A is not output.

      Tip:

      Codes other than DTC B161A may be output at this time, but they are not related to this check.

      Result

      Result

      OK

      NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

    Click here